Tool changing device of numerical control machining center

Abstract

The tool changing device of the numerical control machining center comprises a machine shell, a lifting mechanism, a rotating mechanism and a mechanical arm, the rotating mechanism comprises a rotating driving piece and a rotating shaft connected with the rotating driving piece, and the lifting mechanism is fixedly connected with the machine shell and then connected with the rotating driving piece. The tail end of the rotating shaft extends outside the bottom of the shell; the manipulator comprises clamping parts, a connecting part and a supporting part, a first connecting hole matched with the rotating shaft is formed in the middle of the connecting part, the clamping parts are arranged on the two sides of the connecting part in a central symmetry mode with the circle center of the first connecting hole as the center, and the clamping parts abut against the connecting part; a second connecting hole is formed in the middle of the supporting part, the rotating shaft is sleeved with the supporting part through the second connecting hole, and the supporting part is arranged at the bottom of the connecting part; the top side of the supporting part is provided with a first spring connected with the two clamping parts. According to the tool changing device of the numerical control machining center, bending deformation caused by extrusion during tool changing is avoided, and the tool changing stability is high.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining centers, and in particular to a tool changing device for CNC machining centers. Background Technology

[0002] A CNC machining center is a high-efficiency automated machine tool composed of mechanical equipment and a CNC system, suitable for machining complex parts. The robotic arm in a CNC machining center with automatic tool changing function needs to first engage the tool in the tool slot. The spindle then releases the tool, pushing it out. During this process, there is a downward compression distance, causing the robotic arm to bear some of the downward force. If the structural design is poor, the end of the robotic arm may bend and deform downwards, affecting subsequent tool changing operations. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a tool changing device for CNC machining centers, which avoids deformation due to compression and bending during tool changing, and provides strong tool changing stability.

[0004] The technical solution of this utility model is as follows:

[0005] A tool changing device for a CNC machining center includes a housing, a lifting mechanism, a rotating mechanism, and a robot arm. The lifting mechanism and the rotating mechanism are both housed within the housing. The rotating mechanism includes a rotating drive component and a rotating shaft connecting to the rotating drive component. The lifting mechanism is fixedly connected to the housing and then connected to the rotating drive component. The end of the rotating shaft extends to the outer bottom of the housing. The robot arm includes a clamping part, a connecting part, and a supporting part. The connecting part has a first connecting hole in its center that matches the rotating shaft. The clamping parts are centrally symmetrically arranged on both sides of the connecting part with the center of the first connecting hole as the center, and the clamping parts abut against the connecting part. The supporting part has a second connecting hole in its center, and the supporting part is sleeved on the rotating shaft through the second connecting hole, and the supporting part is located at the bottom of the connecting part. A first spring connecting the two clamping parts is provided on the top side of the supporting part.

[0006] In a further technical solution, the clamping part includes a clamping block, a locking block, and a second spring. The clamping block abuts against the connecting part. An arc-shaped clamping groove is formed on the side of the clamping block away from the connecting part. A retaining ring is provided in the arc-shaped clamping groove. A movable groove is formed on the side of the arc-shaped clamping groove near the connecting part. The second spring is disposed in the movable groove. The locking block is disposed at the end of the second spring. One side of the locking block is wedge-shaped and extends into the arc-shaped clamping groove. The top end of the first spring is connected to the bottom of the clamping block.

[0007] In a further technical solution, the movable groove has a circular cross-section, and a stop block that matches the movable groove and connects to the locking block is provided inside the movable groove. A limiting ring for the stop block is provided at the opening of the movable groove, and the locking block is connected to the second spring through the stop block.

[0008] In a further technical solution, the connecting part is provided with a sliding groove on the side facing the clamping block, and the clamping block is provided with a first slider that matches the sliding groove.

[0009] In a further technical solution, the bottom of the clamping block is provided with a guide post, the support part is provided with a guide hole matching the guide post, and the first spring is sleeved on the outside of the guide post between the clamping block and the support part.

[0010] In a further technical solution, the rotary drive component includes a motor, a mounting housing, a first gear, and a second gear. The mounting housing is connected to the machine housing, the motor is located on the top side of the mounting housing, the first gear and the second gear are meshed with each other and located inside the mounting housing, the first gear is connected to the motor shaft, and the second gear is sleeved on the rotating shaft.

[0011] In a further technical solution, a slide rail is vertically provided on the opposite side wall of the housing, and a second slider matching the slide rail is provided on both sides of the mounting shell.

[0012] In a further technical solution, the lifting mechanism is a cylinder, and the end of the cylinder is connected to a mounting shell.

[0013] The beneficial effects of this utility model are:

[0014] 1. The lifting mechanism can lift the robot arm and work with the rotating mechanism to complete the tool picking and changing operation. During this process, when the gripping part of the robot arm holds the tool and the spindle releases the tool, the gripping part is subjected to the pressure from the spindle releasing the tool and compresses the first spring. The gripping part moves downward a certain distance relative to the connecting part. The two can move relative to each other, which can avoid the end of the robot arm being directly squeezed and bent. After the lifting mechanism lowers the robot arm, the first spring rebounds after the robot arm loses the pressure from the spindle, and the gripping part resets to continue the tool changing operation.

[0015] 2. The sliding groove has a limiting effect on the clamping block, and the guide post has a guiding effect on the clamping block, which can make the clamping block rise and fall smoothly;

[0016] 3. The slide rails ensure smooth lifting and lowering of the rotating mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a tool changing device for a CNC machining center according to an embodiment of the present invention;

[0018] Figure 2 This is a top view schematic diagram of the robotic arm described in an embodiment of this utility model;

[0019] Figure 3 yes Figure 1 Enlarged diagram of point A in the middle.

[0020] Explanation of reference numerals in the attached figures:

[0021] 10. Housing; 11. Slide rail; 20. Cylinder; 31. Motor; 32. Mounting housing; 33. First gear; 34. Second gear; 35. Rotating shaft; 36. Second slider; 40. Connecting part; 41. First connecting hole; 50. Clamping block; 51. Snap ring; 52. Clamping block; 53. First slider; 54. Abutment block; 55. Second spring; 56. Guide post; 57. First spring; 60. Support part. Detailed Implementation

[0022] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] Example:

[0024] like Figures 1-3 As shown, a tool changing device for a CNC machining center includes a housing 10, a lifting mechanism, a rotating mechanism, and a robot arm. The lifting mechanism and the rotating mechanism are both housed within the housing 10. The rotating mechanism includes a rotating drive component and a rotating shaft 35 connecting to the rotating drive component. The lifting mechanism is fixedly connected to the housing 10 and then connected to the rotating drive component. The end of the rotating shaft 35 extends to the outer bottom of the housing 10. The robot arm includes a clamping part, a connecting part 40, and a supporting part 60. The connecting part 40 has a first connecting hole 41 in the middle that matches the rotating shaft 35. The connecting part 40 is sleeved onto the rotating shaft 35 through the first connecting hole 41. 5. The clamping part includes a clamping block 50, a locking block 52, and a second spring 55. The clamping block 50 is centrally symmetrically arranged on both sides of the connecting part 40 with the center of the first connecting hole 41 as the center. The clamping block 50 abuts against the connecting part 40. An arc-shaped clamping groove is opened at the end of the clamping block 50 away from the connecting part 40. A retaining ring 51 for locking the tool groove is provided in the arc-shaped clamping groove. A movable groove is opened on the side of the arc-shaped clamping groove near the connecting part 40. The second spring 55 is located in the movable groove. The locking block 52 is located at the end of the second spring 55. One side of the locking block 52 is wedge-shaped and extends into the arc-shaped clamping groove.

[0025] The clamping part abuts against the connecting part 40; the middle part of the support part 60 is provided with a second connecting hole, and the support part 60 is sleeved on the end of the rotating shaft 35 through the second connecting hole and is located at the bottom of the connecting part 40; the top side of the support part 60 is provided with a first spring 57 connecting the bottom of the two clamping blocks 50 respectively.

[0026] The working principle of the above technical solution is as follows:

[0027] In use, the robotic arm can rotate under the drive of the rotary drive component. The clamping slots of the clamping block 50 clamp the tools in the tool magazine and the tools that need to be replaced on the spindle. During clamping, the arc-shaped clamping slot is aligned with the groove on the tool and rotated to lock in. During the locking process, the tool squeezes the locking block 52 and compresses the second spring 55. When the tool passes the locking block 52, the locking block 52 springs back to its original position. The arc-shaped clamping slot and the locking block 52 respectively lock the two sides of the groove on the tool to form a clamping. When the spindle releases the tool, the clamping block 50 is subjected to the pressure of the tool release from the spindle and then compresses the first spring 57. The clamping block 50 moves downward a certain distance relative to the connecting part 40. The two can move relative to each other, which can avoid the end of the robotic arm being directly squeezed and bent. After the lifting mechanism lowers the robotic arm, the first spring 57 rebounds after the robotic arm loses the pressure from the spindle, and the clamping block 50 resets to continue the tool changing operation.

[0028] In another embodiment, such as Figure 3 As shown, the movable groove is a groove with a circular cross-section. The movable groove is also provided with a stop block 54 that matches the movable groove and connects to the locking block 52. A limiting ring of the stop block 54 is provided at the opening of the movable groove. The locking block 52 is connected to the second spring 55 through the stop block 54.

[0029] When the second spring 55 extends naturally, the stop block 54 is limited by the limiting ring, restricting the spring within the movable groove. The end of the locking block 52 extends out of the movable groove. When the second spring 55 is compressed, the stop block 54 moves against the inner wall of the movable groove, making the locking block 52 move smoothly.

[0030] In another embodiment, such as Figure 2 As shown, the connecting part 40 has a sliding groove on the side facing the clamping block 50. The sliding groove is a dovetail groove. The clamping block 50 has a first slider 53 that matches the sliding groove. The bottom of the clamping block 50 has a guide post 56. The support part 60 has a guide hole that matches the guide post 56. The first spring 57 is sleeved on the outside of the guide post 56 between the clamping block 50 and the support part 60.

[0031] The slide groove has a limiting function for the clamping block 50, and the guide post 56 has a guiding function for the clamping block 50, which can make the clamping block 50 rise and fall smoothly.

[0032] In another embodiment, such as Figure 1 As shown, the rotary drive includes a motor 31, a mounting housing 32, a first gear 33, and a second gear 34. The mounting housing 32 is connected to the housing 10. The motor 31 is located on the top side of the mounting housing 32. The first gear 33 and the second gear 34 are meshed with each other and are located inside the mounting housing 32. The first gear 33 is connected to the shaft of the motor 31, and the second gear 34 is sleeved on the rotating shaft 35. A slide rail 11 is vertically provided on the opposite side wall of the housing 10, and second sliders 36 matching the slide rail 11 are provided on both sides of the mounting housing 32. The lifting mechanism is a cylinder 20, and the end of the cylinder 20 is connected to the mounting housing 32.

[0033] The motor 31 drives the first gear 33 to mesh with the second gear 34 to rotate, causing the machine shaft to rotate and driving the mechanical claw to rotate; and the cylinder 20 drives the mounting shell 32 to achieve smooth lifting and lowering of the mechanical claw.

[0034] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A tool changer of a numerically controlled machining center, characterized by, Including the casing, the lifting mechanism, the rotating mechanism and the manipulator, the lifting mechanism and the rotating mechanism are arranged in the casing, the rotating mechanism includes the rotating drive part and the connecting rotating drive part's rotating shaft, the lifting mechanism fixedly connected casing rear and rotating drive part connection;The rotating shaft end extends to the bottom outside of the casing;The manipulator includes the clamping part, the connecting part and the support part, the connecting part middle part is equipped with the first connecting hole matched with the rotating shaft, the clamping part is centrally symmetric with the first connecting hole center as the center and is arranged on both sides of the connecting part, and the clamping part is in abutment with the connecting part;The middle part of the support part is provided with a second connecting hole, the support part is sleeved on the rotating shaft through the second connecting hole, and the support part is arranged at the bottom of the connecting part;The top side of the support part is respectively provided with the first spring connected with the two clamping parts.

2. A tool changer for a numerically controlled machining center according to claim 1, characterized in that The clamping part includes a clamping block, a clamping block and a second spring, the clamping block is in abutment with the connecting part, the side of the clamping block away from the connecting part is provided with an arc-shaped clamping groove, the arc-shaped clamping groove is provided with a clamping ring, the side of the arc-shaped clamping groove close to the connecting part is provided with a movable slot, the second spring is arranged in the movable slot, the clamping block is arranged at the end of the second spring, the side of the clamping block is wedge-shaped, and extends into the arc-shaped clamping groove;The top end of the first spring is connected with the bottom of the clamping block.

3. A tool changer for a numerically controlled machining center according to claim 2, characterized in that The movable slot is circular in cross section, and the movable slot is further provided with a stop block matched with the movable slot and connected with the clamping block, and the movable slot is provided with a limiting ring of the stop block at the slot opening, and the clamping block is connected with the second spring through the stop block.

4. The tool changer of claim 2, wherein, The side of the connecting part facing the clamping block is provided with a sliding groove, and the clamping block is provided with a first sliding block matched with the sliding groove.

5. A tool changer for a numerically controlled machining center according to claim 4, characterized in that, The bottom of the clamping block is provided with a guide column, the support part is provided with a guide hole matched with the guide column, and the first spring is sleeved outside the guide column between the clamping block and the support part.

6. The tool changer of claim 1, wherein, The rotating drive part includes a motor, a mounting shell, a first gear and a second gear, the mounting shell is connected with the casing, the motor is arranged at the top side of the mounting shell, the first gear and the second gear are arranged in the mounting shell and are in mesh with each other, the first gear is connected with the shaft of the motor, and the second gear is sleeved on the rotating shaft.

7. A tool changer for a numerically controlled machining center according to claim 6, characterized in that The opposite side walls of the casing are vertically provided with sliding rails, and the two sides of the mounting shell are provided with second sliding blocks matched with the sliding rails.

8. The tool changer of claim 6, wherein, The lifting mechanism is a gas cylinder, and the gas cylinder is connected with the mounting shell at the end.

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